diff --git a/test/spec/ol/render/webgl/index.test.js b/test/spec/ol/render/webgl/index.test.js
index 0e257a936e..5426879bb3 100644
--- a/test/spec/ol/render/webgl/index.test.js
+++ b/test/spec/ol/render/webgl/index.test.js
@@ -1 +1,62 @@
 goog.provide('ol.test.render.webgl.Replay');
+
+goog.require('ol.render.webgl.Replay');
+
+describe('ol.render.Replay', function() {
+  var replay;
+  beforeEach(function() {
+    replay = new ol.render.webgl.Replay(5, [-180, -90, 180, 90]);
+  });
+
+
+  describe('constructor', function() {
+    it('stores view related data', function() {
+      expect(replay.tolerance).to.be(5);
+      expect(replay.maxExtent).to.eql([-180, -90, 180, 90]);
+      expect(replay.origin).to.eql([0, 0]);
+    });
+
+    it ('sets up the required matrices', function() {
+      var mat3 = [1, 0, 0, 1, 0, 0];
+      var mat4 = [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1];
+      expect(replay.projectionMatrix_).to.eql(mat3);
+      expect(replay.offsetRotateMatrix_).to.eql(mat3);
+      expect(replay.offsetScaleMatrix_).to.eql(mat3);
+      expect(replay.tmpMat4_).to.eql(mat4);
+    });
+  });
+
+  describe('#replay', function() {
+    var gl = {
+      uniformMatrix4fv: function() {},
+      uniform1f: function() {}
+    };
+    var context = {
+      bindBuffer: function() {},
+      getGL: function() {
+        return gl;
+      }
+    };
+    beforeEach(function() {
+      replay.setUpProgram = function() {
+        return {
+          u_projectionMatrix: true,
+          u_offsetScaleMatrix: true,
+          u_offsetRotateMatrix: true,
+          u_opacity: true
+        };
+      };
+    });
+
+    it('calculates the correct matrices', function() {
+      var sin = Math.sin(Math.PI);
+      replay.replay(context, [0, 0], 10, Math.PI, [10, 10], 1, 0, {}, undefined,
+          false, undefined);
+
+      expect(replay.projectionMatrix_).to.eql([-0.02, -sin * 0.02, sin * 0.02,
+        -0.02, 0, 0]);
+      expect(replay.offsetRotateMatrix_).to.eql([-1, -sin, sin, -1, 0, 0]);
+      expect(replay.offsetScaleMatrix_).to.eql([0.2, 0, 0, 0.2, 0, 0]);
+    });
+  });
+});